Contingencies And Commitments (Narrative) (Details) - Senior Notes [Member] - Fixed Rate, 8.625%, Due 2020 [Member] - Ferrellgas Partners Finance Corp. [Member]
$ in Millions
6 Months Ended
Jan. 31, 2016
USD ($)
Debt principal amount $ 182.0
Debt interest rate 8.625%
Debt maturity year 2020